Distribution of <Emphasis Type="Italic">Typhula ishikariensis</Emphasis> Biotype A Isolates Belonging to a Predominant Mycelial Compatibility Group |
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Authors: | Naoyuki MATSUMOTO Akira KAWAKAMI Satoshi IZUTSU |
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Institution: | (1) National Institute of Agro-Environmental Sciences, 3-1-1, Kannondai, Tsukuba 305-8604, Japan, JP;(2) Hokkaido National Agricultural Experiment Station, 1, Hitsujigaoka, Toyohira-ku, Sapporo 062-8555, Japan, JP;(3) National Research Institute of Vegetables, Ornamental Plants and Tea, Ano-cho, Age-gun, Mie 514-2393, Japan, JP |
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Abstract: | The distribution pattern and frequency of isolates of a snow mold fungus, Typhula ishikariensis biotype A belonging to a predominant MCG (mycelial compatibility group, referred to as super MCG), were surveyed throughout
its habitat from northern Honshu to eastern Hokkaido. About 38 and 14% of isolates examined belonged to super MCG in eastern
and central Hokkaido, respectively ; however, super MCG was never found in southern Hokkaido or northern Honshu. These findings
imply that T. ishikariensis biotype A consists of two populations in Japan, i.e., one that is distributed in Honshu and southern Hokkaido and lacks super MCG isolates, and the other that includes super
MCG isolates and exists in central and eastern Hokkaido. The difference in distribution pattern of the two populations is
discussed in terms of geological history during the Pleistocene (2 million to 10 thousand years ago). The tendency of global
warming, which alleviates freezing damage, was considered to be responsible for the outbreak of this fungus in eastern Hokkaido.
Received 6 December 1999/ Accepted in revised form 9 December 1999 |
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Keywords: | : distribution Pleistocene global warming Typhula ishikariensis mycelial compatibility group |
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